Which part did you replace? Try checking the following areas. A code P0171 may mean that one or more of the following has happened: The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor. Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve. Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector. Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor Try this web page. https://www.obd-codes.com/p0171
P0171 means that you sensor is reading a lean message. There is probably a small vacuum leak around your intake manifold or a small exhaust leak near the sensor.
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Which part did you replace? Try checking the following areas.
- A code P0171 may mean that one or more of the following has happened:
- The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled.
- There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
- There could be a vacuum leak downstream of the MAF sensor.
- Possible cracked vacuum or PCV line/connection Faulty or stuck open PCV valve.
- Failed or faulty oxygen sensor (bank 1, sensor 1) Sticking/plugged or failed fuel injector.
- Low fuel pressure (possible plugged/dirty fuel filter!) Exhaust leak between engine and first oxygen sensor
Try this web page. https://www.obd-codes.com/p0171
P0171 means that you sensor is reading a lean message. There is probably a small vacuum leak around your intake manifold or a small exhaust leak near the sensor.